package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import com.sun.deploy.net.HttpResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String path;


    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString()+suffix;
        //创建一个目录对象
        File dir = new File(path);
        //判断目录是否存在
        if (!dir.exists()){
            //目录不存在，需要创建
            dir.mkdir();
        }
        file.transferTo(new File(path+fileName));
        System.out.println(path);
        return R.success(fileName);
    }


    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws IOException {
        //输入流，通过输入流读取文件
        FileInputStream fileInputStream = new FileInputStream(new File(path+name));
        response.setContentType("image/jpeg");
        //输出流，通过输出流将文件写回浏览器，在浏览器展示图片
        ServletOutputStream outputStream = response.getOutputStream();
        byte[] bytes = new byte[1024];
        int len = 0;
        while ((len=fileInputStream.read(bytes))!=-1){
            outputStream.write(bytes,0,len);
            outputStream.flush();
        }
        //关闭资源
        outputStream.close();
        fileInputStream.close();
    }

}
